package kr.hkit.powerjava.chapter24.work;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;

public class StudentDao implements InterfaceStudent<Student>{
	private static final String FILE = "stdlist.data";
	private ArrayList<Student> arList;
	
	
	public StudentDao() {
		arList = new ArrayList<>();
	}
	
	@Override
	public void insertItem(Student item) {
		arList.add(item);
		
	}

	@Override
	public void deleteItem(Student item) {
		arList.remove(item);
		
	}

	@Override
	public void updateItem(Student item) {
		arList.set(arList.indexOf(item), item);
		
	}

	@Override
	public void prnItem() {
		for(Student std : arList) {
			System.out.println(std);
		}
		
	}
	
	public void prnItem(ArrayList<Student>) {
		
	}

	@Override
	public Student searchItem(Student item) {
		if(arList.contains(item)) {
			return arList.get(arList.indexOf(item));
		} else {
			return null;			
		}
	}

	@Override
	public ArrayList<Student> loadList() {
		ObjectInputStream ois = null;
		ArrayList<Student> list = null;
		try {
			ois = new ObjectInputStream(new BufferedInputStream(new FileInputStream(StudentDAO.FILE)));
			list = (ArrayList<Student>) ois.readObject();
		} catch (Exception e) {
			new FileInputStream(StudentDao.FILE);
		} finally {
			if(ois != null) try {ois.close(); } catch (Exception e) {}
		}
		return list;
	}

	@Override
	public void saveList() {
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream(StudentDAO.FILE)));
			oos.writeObject(arList);
			oos.flush();
		}catch (Exception e){
			e.printStackTrace();
		} finally {
			if(oos != null) try {oos.close(); } catch (Exception e) {}
		}
	}	
}
